Ammeters are electrical meters that measure current through a circuit. They give their readings in "amps" as the units for measuring current. After performing an electrical installation, you should test the circuit for current and the amount of current through it; compare the reading with the installation's rating if present.
Voltmeters are equipment that measures the voltage across a circuit. Some people refer to voltage as "potential difference." This is expressed in "volts" as its units of measure. When using a voltmeter, you should connect it parallel to the circuit . After installing any electrical equipment or appliances, measure the voltage through them so that you may compare the readings to the component's voltage rating.
Ohmmeters are instrumental in measuring the resistance through a circuit as well as the continuity of the circuit. Measuring resistance is necessary for installations, such as speakers, that highly depend on the right resistance to function properly. Continuity on the other hand is important for all installations to check whether current is flowing at all, or there is a point in the circuit that it discontinues.
An electricity meter is an instrument that measures the quantity of electrical energy that equipment or appliances consume or produce. Power utility companies install these in residential houses and industries to measure how much electricity these units consume.
A multimeter is a popular tool for electrical installations due to its wide range of application. It encompasses the functions of ammeters, ohmmeters and voltmeters in one unit; making it economical and less bulky. On the multimeter's interface, there are various modes that you can switch through using a knob depending on what you intend to measure.